mctighe



(No Model.) 2 Sheets-Sheet 1.

T. J. MQTIGHE.

DYNAMO ELECTRIC MACHINE.

No. 288,829. Patented Nov. 20, 1883.

(No ModeL) 2 Sheets-Sheet 2.

T. J. MGTIGHE.

DYNAMU ELECTRIC MACHINE.

No. 288,829. Patented Nov. 20, 1883.

J79. 9% Q W74 N. PETERS. PMlwl-ilhngrnphcn wunin wn. 0.0

UNITED STATES PATENT rricn.

THOMAS J. MOTIGHE, OF PITTSBURG, PENXSYLVANIA.

DYNAMO-ELECTRIC MACHINE.

STECIFICATION forming part of Letters Patent No. 288,829, dated November 20, 1883.

Application filed July 80, 1883.

To all whom it may concern.-

Be it known that I, Tnonxs J. MoTrcnn, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Dynamo Electric Machines 5 and I do hereby declare that the following is a full, clear, and exact description of the inventiomwhich will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings,which form a part of this specification, in which Figure lis a side elevation, and Fig. 2 an end elevation, of my improved form of machine.

This invention relates to dynamo-electric machines, and has for its object an increase in the magnetic induction by concentrating the so-called free magnetism without increasing the amount of wire wound upon the cores, and to further increase such magnetism by intensifying the induction externally of the inducing-coils.

The invention consists in the novel con struction and arrangement of parts, substantially as hereinafter fully described and claimed.

In the drawings. A designates the two parallel cores of iron, oblong in section, and wound with the inducing-wire a, so connect ed in the circuit as to similarly polarize the cores A. The cores are wide, and may be either oblong or fiat. As will be seen, the cores A form the frame of the machine, and occupy nearly its entire height. The cores are connected to form intermediate consequent poles at the top by the downwardlydipping pole-piece N, and below by the up wardly-extending polepiece S, both massive. The adjacent faces of N and S form a portion of a circle for the reception of the an mature, and the circular extensions 2) b are formed with their outer faces close to and substantially parallel with the face of the wire coils a. The results of this formation are manifold. Of iron there are only the cores (entirely surrounded by inducing-wires) and the pole-pieces; hence no parts exist, save the pole-pieces, to become consequent points for useless dispersion of magnetism;

(N0 model.)

but, on the contrary, all is concentrated at the poles. Again, as the mass of the polepieces is in close proximity to and substantially parallel with the axis of winding of wire a, a powerful induction takes place from the current in wires (0 externally upon said pole-pieces at b b, and as the said external induction is of the same nature as that communicated by contact of poles N and S with cores A a considerable gain is effected magnetically for a given current and amount of wire. The cores A and pole-pieces N S are independent of one another and bolted to gcther. This allows the cores A tobe readily wound and fitted, so as to have the outer layers of wire in very close inductive proximity to the extensions Z) Z) of the pole-pieces. There is thus no part of the frame A A N S which is not working magnetically to the best possible advantage, no yokes or awkward projections in which magnetism can be wasted externally. The armature is journaled in the diamagnetic brackets C and D, which are bolted to the pole-pieces in any suitable manner.

It is obvious that like results would follow if the positions were at right angles to that shown-viz., with the cores A horizontal instead of vertical. I prefer the form shown, however.

I claim as my invention In a dynamo-electric machine, the combination of the similarly-polarized parallel flat magnets A a A a, joined at their extremities by the inwardly-projecting pole-pieces N and S, having the lips or extensions Z) Z), substantially parallel with and in close proximity to the external layers of wire, a, and forming be tween them a curved armaturespace whose axis is parallel to the general plane of said magnets A a, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence oftwo witnesses.

THOMAS J. MQTIGHE.

\Vi tn esses:

T. J. Px'r'rnnsox, D. E. Davis. 

